French Onion Galette
Ingredients
- 1 large yellow onion
- 2 Tbs. unsalted butter
- Pinch of sugar
- Kosher salt and freshly ground pepper
- 1/4 cup (2 fl. oz./60 ml) dry sherry
- 1/2 cup (4 fl. oz./125 ml) beef broth
- 4 fresh thyme sprigs, plus thyme leaves for garnish
- All-purpose flour for dusting
- 1 sheet frozen puff pastry, thawed
- 2 Tbs. Dijon mustard
- 1 cup (4 oz./125 g) grated Gruyère cheese
- 1 egg, beaten with 1 Tbs. water
- Kosher salt and freshly ground pepper
- Chopped fresh chives for garnish
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